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Foothill Sanitary Landfill – Seismic Characterization 6 03.18.2015 Tab l e 2 Co mp ari so n o f Previ ou s an d Cu rrent Seismi c Ch arac teri zati on s of Ground Mo t ion Resp onse Fault / Fault Zon e Name MCE Dis t an ce f ro m L an dfil l Site Pr evi o us MPE Ev al uation s 1, 2 Cu rrent CB &I MCE Eval u at ion 3 Mo ment Magn itud e Mod el ed Med ian Ho r izon t al PGArock (VS30=varies)1 Det erm ined b y Ab raham so n (2002) Med ian Ho r izon t al PGArock (at VS30=760 m/s) Det erm ined by Sh aw (2012) Mo ment Magn itud e Mod el ed PEER 2008 NGA Mod el: Ab r ah amson & Sil va PEER 2014 NGA West-2 Mod el: Ab r ah amson & Sil va Median +½ı Hor izo ntal PGA 3 (at VS30=455 m/s) Median +½ı Hor izo ntal PGA 3 (at VS30=455 m/s) Gr eat Val ley 7 (Cen t ral Valley Coas t ) 59.3 km 6.5 (6.9)0.05 g 0.05g 6.90 0.1351g 0.1154g Mount Diablo 84.55 km - - not evaluated not evaluated 6.70 0.1009g 0.0766g N. San Andreas (SA O+SA N+SAP+SAS) 133.0 km 8.0 (8.1)0.05g 0.05g 8.05 0.0970g 0.0789g Hayward / Rod gers Creek (RC+HN+HS) 102.5 km 7.0 (7.3)0.03g 0.04g 7.33 0.0736g 0.0616g Green vi lle 74.4 km 6.3 (7.0)0.03g 0.04g 7.00 0.0704g 0.0688g Cal veras (CN+CC+CS) 94.6 km 6.6 (7.0)0.03g 0.04g 7.03 0.0661g 0.0554g Green Valley 93.4 km - - (6.8) not evaluated 0.03g 6.80 0.0627g 0.0504g Green Valley 93.4 km - - (6.8) not evaluated 0.03g 6.80 0.0627g 0.0504g Orgalit a 89.4 km - - (7.10) not evaluated not evaluated 7.10 0.0610g 0.0566g Sourc e: The MCE distance from Landfill site and moment magnitude modeled in the current CB&I models were obtained from the USGS 2008 and 2014 Fault Source Parameters. No tes: 1. The 2002 Abrahamson PGAs were determined using the following attenuation models: Sadigh et al (1997), Idriss (1991, 1995), Boore et al (1997), Campbell (1997), and Abrahamson and Silva (1997). The shear wave velocity was assumed equal to 620 m/sec for Boore et al (1997) and 760 m/s for all others. The moment magnitude assumed in the model is shown above in the 3rd colum as the smaller of the two magnitude numbers (without parenthesis). An average of the median PGA values from all of the models was calculated and reported as the median PGA value for the MPE. 2. The 2012 Shaw PGAs were determined using the Campbell and Bozorgnia (2008) model with an assumed value of 760 m/s for VS30 to calculate the median PGA value. 3. PGA values were modeled with a shear wave velocity (Vs) of 455 m/s (refer to Figures 2 and 3 for determination of value). 5.0 Res u l t s The MCE is characterized by a near-field event of 6.90 MW on the Great Valley 7 Fault located approximately 59.33 km away from the Landfill site generating a PGA (median +½ standard deviation) of 0.1351g; and a far-field event of 8.05 MW on the N. San Andreas Fault (SAO+SAN+SAP+SAS) system located approximately 132.99 km away from the Landfill site generating a PGA (median +½ standard deviation) of 0.0971g. Table 3 on the following page summarizes the controlling near-field and far-field events due to the Great Valley 7 and N. San Andreas Faults; and also the intermediate-field event due to the Mount Diablo Fault. The median and median plus ½ standard deviation controlling ground motion spectra are presented in Table 4 on the following page. The columns shaded in gray show that for spectral periods up to 0.50 seconds, the Great Valley 7 is the controlling event, and for periods above 0.50 seconds, the N. San Andreas is the controlling event.